Updated to 10.5 on XP and now iTunes will NOT open - Entry Point Not Found - HELP!

Tried to update to iTunes 10.5 on Windows XP.  Everything seemed to install properly and I restarted.  However, when I try to open iTunes, it will not open and I get the following error message:
iTunes.exe - Entry Point Not Found
'The procedure entry point AVCFAssetClassWithByteStreamAndOptions coulf not be located in the dynamic link library AVFoundationCF.dll'
When I click 'OK' (which is the only option), it says:
'iTunes was not installed correctly.  Please reinstall iTunes.
Error 7 (Windows error 127)'
I have updated iTunes on my machine in the past numerous times without ever having an issue.  Now, I get this and cannot access iTunes at all.  I have tried reinstalling 10.5 and restarting my machine about five times now...to no avail.  I am hesitant to remove iTunes, since I have 6000 songs and do not want to lose my library.  Is there anything I can do?  Seems like it should be a simple fix.
When I called Apple, they told me to upgrade my OS to Vista.  Huh?  That seems like overkill to me.  iTunes has always run fine on XP.
Please help!

I found another site and it suggested that I go through System Preferences and check downloads again.  The iTunes update was still there indicating that it still needed to be downloaded.  So I downloaded it again and now it works fine.  I hope this might help someone else.
Thank you

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